Global greenhouse gas emissions are estimated to decline over the next decade but at a pace “still not nearly fast enough” to avoid the worst climate impacts, the UN’s top climate official warned as a partial assessment of new national climate plans was released.
UNFCCC Executive Secretary Simon Stiell said global emissions are expected to fall by around 10% by 2035 based on a preliminary assessment of new national climate targets (NDCs) announced by countries that produce nearly 60% of the world’s greenhouse gases.
The Intergovernmental Panel on Climate Change (IPCC) has said that countries should cut their emissions much more rapidly, with a 60% drop from 2019 required by 2035 to limit global warming to 1.5C.
“Ten years after we adopted the Paris Agreement, we can say simply – it is delivering real progress,” said Stiell. “But it must work much faster and fairer, and that acceleration must start now.”
Country delays hamper UN review
Countries are expected to discuss the shortfall in emissions-cutting ambition at next month’s COP30 summit in Belém, Brazil, but it is still unclear what form their response will take.
Stiell said COP30 needs to show nations are still fully on board for climate co-operation, as well as accelerating implementation across all economic sectors and connecting climate action to people’s lives.
But with only two weeks to go until leaders arrive in the Amazon city, most nations – including several big emitters – are yet to even publish an updated climate plan, known as a nationally determined contribution (NDC), after missing multiple deadlines, the last of which was September.
The delay caused a headache for the UN climate officials tasked with producing an official review of emission-cutting targets by the end of this month to inform discussions at COP30. That ‘synthesis report’ was released on Tuesday, alongside Stiell’s speech.
But its authors warned against drawing global conclusions from the numbers it contains because the analysis only covers the 64 countries – responsible for 30% of emissions – that formally submitted their NDCs by the end of September. Since then, a handful more have published their plans, including South Africa and Indonesia.
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The 2040 deadline is dependent on external support, but the phase-out will still be achieved unconditionally in the 2040s, according to the country’s updated NDC
An update document is set to be published during COP30, when more NDCs should be submitted.
In the meantime, Stiell said the UN climate body (UNFCCC) did “some additional calculations” which, on top of formal NDC submissions, drew on 2035 targets touted by nations in various unofficial formats.
That includes, for example, China, which promised last month during a UN summit in New York to cut emissions by 7-10% from “peak levels”, and the European Union, which announced the bloc’s 2035 target would “range between 66% and 72%” below 1990 levels. Neither has yet published a full NDC.
This UNFCCC calculation, which unlike the synthesis report has not been published, showed that global emissions are projected to fall by 10% from 2019 levels by 2035.
US U-turn clouds global outlook
That headline figure hides a number of uncertainties. Emission-cutting trajectories can change when vague statements are translated into fully fleshed-out climate plans.
Additionally, the assessment includes the targets submitted by the United States – the world’s second largest emitter – in the final weeks of the Biden administration, which aim to cut emissions by 61-66% below 2005 levels by 2035.
But Donald Trump’s return to the White House has all but shredded that plan. The US president has axed climate policies and slashed funding for clean energy, alongside kicking off the process that will see the country leave the Paris Agreement at the start of next year.
State-level authorities and businesses are still likely to push on with some measures to reduce emissions, despite Washington’s pullback, but the extent to which those can help meet the NDC offered by the Biden administration is unclear.
In his speech on Tuesday, Stiell said those taking strong climate action will reap the rewards “measured in millions of new jobs and trillions in new investment”.
“We are still in the race, but to ensure a livable planet for all eight billion people today, we must urgently pick up the pace,” he added.
The post UN calls for faster emissions cuts for 2035 as first global estimate disappoints appeared first on Climate Home News.
UN calls for faster emissions cuts for 2035 as first global estimate disappoints
American farmers are drowning in health insurance costs, while their German counterparts never worry about medical bills. The difference may help determine which country’s small farms are better prepared for a changing climate.
Samantha Kemnah looked out the foggy window of her home in New Berlin, New York, at the 150-acre dairy farm she and her husband, Chris, bought last year. This winter, an unprecedented cold front brought snowstorms and ice to the region.
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A Little-Used Maneuver Could Mean More Drilling and Mining in Southern Utah’s Redrock Country
Two Utah Congress members have introduced a resolution that could end protections for Grand Staircase-Escalante National Monument. Conservation groups worry similar maneuvers on other federal lands will follow.
Lawmakers from Utah have commandeered an obscure law to unravel protections for the Grand Staircase-Escalante National Monument, potentially delivering on a Trump administration goal of undoing protections for public conservation lands across the country.
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Drought and heatwaves occurring together – known as “compound” events – have “surged” across the world since the early 2000s, a new study shows.
Compound drought and heat events (CDHEs) can have devastating effects, creating the ideal conditions for intense wildfires, such as Australia’s “Black Summer” of 2019-20 where bushfires burned 24m hectares and killed 33 people.
The research, published in Science Advances, finds that the increase in CDHEs is predominantly being driven by events that start with a heatwave.
The global area affected by such “heatwave-led” compound events has more than doubled between 1980-2001 and 2002-23, the study says.
The rapid increase in these events over the last 23 years cannot be explained solely by global warming, the authors note.
Since the late 1990s, feedbacks between the land and the atmosphere have become stronger, making heatwaves more likely to trigger drought conditions, they explain.
One of the study authors tells Carbon Brief that societies must pay greater attention to compound events, which can “cause severe impacts on ecosystems, agriculture and society”.
Compound events
CDHEs are extreme weather events where drought and heatwave conditions occur simultaneously – or shortly after each other – in the same region.
These events are often triggered by large-scale weather patterns, such as “blocking” highs, which can produce “prolonged” hot and dry conditions, according to the study.
Prof Sang-Wook Yeh is one of the study authors and a professor at the Ewha Womans University in South Korea. He tells Carbon Brief:
“When heatwaves and droughts occur together, the two hazards reinforce each other through land-atmosphere interactions. This amplifies surface heating and soil moisture deficits, making compound events more intense and damaging than single hazards.”
CDHEs can begin with either a heatwave or a drought.
The sequence of these extremes is important, the study says, as they have different drivers and impacts.
For example, in a CDHE where the heatwave was the precursor, increased direct sunshine causes more moisture loss from soils and plants, leading to a drought.
Conversely, in an event where the drought was the precursor, the lack of soil moisture means that less of the sun’s energy goes into evaporation and more goes into warming the Earth’s surface. This produces favourable conditions for heatwaves.
The study shows that the majority of CDHEs globally start out as a drought.
In recent years, there has been increasing focus on these events due to the devastating impact they have on agriculture, ecosystems and public health.
In Russia in the summer of 2010, a compound drought-heatwave event – and the associated wildfires – caused the death of nearly 55,000 people, the study notes.
The record-breaking Pacific north-west “heat dome” in 2021 triggered extreme drought conditions that caused “significant declines” in wheat yields, as well as in barley, canola and fruit production in British Columbia and Alberta, Canada, says the study.
Increasing events
To assess how CDHEs are changing, the researchers use daily reanalysis data to identify droughts and heatwaves events. (Reanalysis data combines past observations with climate models to create a historical climate record.) Then, using an algorithm, they analyse how these events overlap in both time and space.
The study covers the period from 1980 to 2023 and the world’s land surface, excluding polar regions where CDHEs are rare.
The research finds that the area of land affected by CDHEs has “increased substantially” since the early 2000s.
Heatwave-led events have been the main contributor to this increase, the study says, with their spatial extent rising 110% between 1980-2001 and 2002-23, compared to a 59% increase for drought-led events.
The map below shows the global distribution of CDHEs over 1980-2023. The charts show the percentage of the land surface affected by a heatwave-led CDHE (red) or a drought-led CDHE (yellow) in a given year (left) and relative increase in each CDHE type (right).
The study finds that CDHEs have occurred most frequently in northern South America, the southern US, eastern Europe, central Africa and south Asia.
Threshold passed
The authors explain that the increase in heatwave-led CDHEs is related to rising global temperatures, but that this does not tell the whole story.
In the earlier 22-year period of 1980-2001, the study finds that the spatial extent of heatwave-led CDHEs rises by 1.6% per 1C of global temperature rise. For the more-recent period of 2022-23, this increases “nearly eightfold” to 13.1%.
The change suggests that the rapid increase in the heatwave-led CDHEs occurred after the global average temperature “surpasse[d] a certain temperature threshold”, the paper says.
This threshold is an absolute global average temperature of 14.3C, the authors estimate (based on an 11-year average), which the world passed around the year 2000.
Investigating the recent surge in heatwave-leading CDHEs further, the researchers find a “regime shift” in land-atmosphere dynamics “toward a persistently intensified state after the late 1990s”.
In other words, the way that drier soils drive higher surface temperatures, and vice versa, is becoming stronger, resulting in more heatwave-led compound events.
Daily data
The research has some advantages over other previous studies, Yeh says. For instance, the new work uses daily estimations of CDHEs, compared to monthly data used in past research. This is “important for capturing the detailed occurrence” of these events, says Yeh.
He adds that another advantage of their study is that it distinguishes the sequence of droughts and heatwaves, which allows them to “better understand the differences” in the characteristics of CDHEs.
Dr Meryem Tanarhte is a climate scientist at the University Hassan II in Morocco, and Dr Ruth Cerezo Mota is a climatologist and a researcher at the National Autonomous University of Mexico. Both scientists, who were not involved in the study, agree that the daily estimations give a clearer picture of how CDHEs are changing.
Cerezo-Mota adds that another major contribution of the study is its global focus. She tells Carbon Brief that in some regions, such as Mexico and Africa, there is a lack of studies on CDHEs:
“Not because the events do not occur, but perhaps because [these regions] do not have all the data or the expertise to do so.”
However, she notes that the reanalysis data used by the study does have limitations with how it represents rainfall in some parts of the world.
Compound impacts
The study notes that if CDHEs continue to intensify – particularly events where heatwaves are the precursors – they could drive declining crop productivity, increased wildfire frequency and severe public health crises.
These impacts could be “much more rapid and severe as global warming continues”, Yeh tells Carbon Brief.
Tanarhte notes that these events can be forecasted up to 10 days ahead in many regions. Furthermore, she says, the strongest impacts can be prevented “through preparedness and adaptation”, including through “water management for agriculture, heatwave mitigation measures and wildfire mitigation”.
The study recommends reassessing current risk management strategies for these compound events. It also suggests incorporating the sequences of drought and heatwaves into compound event analysis frameworks “to enhance climate risk management”.
Cerezo-Mota says that it is clear that the world needs to be prepared for the increased occurrence of these events. She tells Carbon Brief:
“These [risk assessments and strategies] need to be carried out at the local level to understand the complexities of each region.”
The post Heatwaves driving recent ‘surge’ in compound drought and heat extremes appeared first on Carbon Brief.
Heatwaves driving recent ‘surge’ in compound drought and heat extremes
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